opencv多边形轮廓等距缩放
opencv多边形按像素放大或缩小,可用于缩放提取后的轮廓代码示例如下:#!/usr/bin/env python# -*- encoding: utf-8 -*-'''@File:多边形等距缩放.py@data:2021/7/5 15:53@Desciption :@Version:@License :'''import cv2import numpy as npdef scale(data,
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opencv多边形按像素放大或缩小,可用于缩放提取后的轮廓
代码示例如下:
#!/usr/bin/env python
# -*- encoding: utf-8 -*-
'''
@File : 多边形等距缩放.py
@data :2021/7/5 15:53
@Desciption :
@Version :
@License :
'''
import cv2
import numpy as np
def scale(data, sec_dis):
"""多边形等距缩放
Args:
data: 多边形按照逆时针顺序排列的的点集
sec_dis: 缩放距离
Returns:
缩放后的多边形点集
"""
num = len(data)
scal_data = []
for i in range(num):
x1 = data[(i) % num][0] - data[(i - 1) % num][0]
y1 = data[(i) % num][1] - data[(i - 1) % num][1]
x2 = data[(i + 1) % num][0] - data[(i) % num][0]
y2 = data[(i + 1) % num][1] - data[(i) % num][1]
d_A = (x1 ** 2 + y1 ** 2) ** 0.5
d_B = (x2 ** 2 + y2 ** 2) ** 0.5
Vec_Cross = (x1 * y2) - (x2 * y1)
if (d_A * d_B==0):
continue
sin_theta = Vec_Cross / (d_A * d_B)
if (sin_theta==0):
continue
dv = sec_dis / sin_theta
v1_x = (dv / d_A) * x1
v1_y = (dv / d_A) * y1
v2_x = (dv / d_B) * x2
v2_y = (dv / d_B) * y2
PQ_x = v1_x - v2_x
PQ_y = v1_y - v2_y
Q_x = data[(i) % num][0] + PQ_x
Q_y = data[(i) % num][1] + PQ_y
scal_data.append([Q_x, Q_y])
return scal_data
data = [[454 , 76],
[448 ,78],
[444, 81],
[440 , 85],
[438, 90],
[437, 96],
[436 ,101],
[434, 107],
[432 ,112],
[431 ,117],
[430 ,123],
[429, 129],
[428, 134],
[427, 140],
[427, 145],
[427, 151],
[427 ,157],
[427 ,163],
[427, 169],
[427, 175],
[427, 181],
[427, 187],
[428, 193],
[428 ,199],
[429, 204],
[429, 210],
[429 ,216],
[430, 222],
[431, 227],
[431, 233],
[431, 239],
[432, 245],
[433, 250],
[434, 256],
[435 ,261],
[436 ,267],
[437 ,272],
[438, 278],
[439, 283],
[441, 289],
[442, 294],
[443, 300],
[445, 305],
[446, 310],
[448, 316],
[450, 321],
[453, 330],
[461, 334],
[466, 336],
[471, 338],
[477 ,340],
[482, 340],
[488, 341],
[494, 341],
[500, 341],
[506 ,341],
[511 ,340],
[517, 339],
[523 ,338],
[528, 337],
[533, 335],
[539, 333],
[544, 331],
[549, 329],
[553, 326],
[558, 322],
[562, 318],
[566, 313],
[568, 308],
[569, 303],
[570, 297],
[570, 291],
[569, 285],
[569, 280],
[568, 274],
[567, 268],
[566 ,263],
[566 ,257],
[564 ,252],
[564 ,246],
[562, 241],
[561, 235],
[560, 230],
[560, 224],
[558 ,219],
[558, 213],
[556, 207],
[555, 202],
[554, 196],
[553, 191],
[552, 185],
[550, 180],
[549, 174],
[548, 169],
[547 ,164],
[545 ,158],
[543 ,153],
[541 ,148],
[539 ,143],
[536 ,138],
[533 ,133],
[530, 128],
[528 ,124],
[524 ,119],
[520 ,115],
[515, 111],
[511, 108],
[506 ,106],
[501 ,104],
[495 ,102],
[490, 101],
[485 , 99],
[480 , 97],
[475 , 93],
[471 , 89],
[468 , 84],
[465, 80],
[460 , 76]]
data1 = scale(data,-10)
print(data1)
temp = np.ones((1300,1000,3), np.uint8) * 255
#cv2.polylines(temp, data1, 1, 255)
cv2.polylines(temp , [np.array(data , dtype=np.int32)], True, (255, 0, 0), 1)
cv2.polylines(temp , [np.array(data1 , dtype=np.int32)], True, (0, 0, 255), 1)
cv2.imshow ("img",temp)
cv2.imwrite("1.jpg",temp)
cv2.waitKey(0)
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